Ella layout diagrams

Please note the following:

	These are NOT official layout diagrams. They are amended from those supplied by DIYhifiSupply when I built my kit in February 2005 and so are based on the Point-to-Point wired Ella. The older PCB version might use different components and the newer Ella Signature (Dual mono) certainly does.
	The layouts shown do not match the original version. I have changed the wiring on tubes 1 and 2 so that they are identical while Brian's original versions had the triodes reversed. This is possible because the 6922 is a dual triode.

Click on each diagram for a larger image.

Normal Ella

Ella for Django Transformer Volume Control

NEVER connect a CD player or other source to the RCAs when wired like this! There is no volume control in the circuit so the amp will play at full volume.

Active Bias System

It was easiest to use a combination of the Django and Upgraded bias pot diagrams to draw this, but the ABS doesn't need either of these changes to be installed. Note that I've chosen to keep one of the existing 22K bias pots on each channel since it allows me to easily change the bias if I change between types of tubes (EL34, 6550 or KT88). So I have changed resistor R14 on the ABS to 7.5K, giving a maximum total resistance of 5.6K and a total maximum current of 60mA.

Upgraded bias pots

The pots have been wired here in reverse to the normal Ella. In this version turning the screw clockwise increases the measured bias voltage. If you prefer the original Ella version swap the red and black wires at each pot.

Ella as Triode with no Negative Feedback

Schottky diodes

Negative bias diodes and bypass capacitors

Screen diodes

or in triode mode:

This site was designed and created by Graham O'Neill, March 2006.